The Bitz cup and saucer in grey are made of sturdy stoneware. The outside has a reactive, matte glaze that gives each cup and surface a unique look while contrasting nicely with the cup's shiny, colourful inside. Over time, the surface will acquire a natural patina, making the piece even more special. Feel free to match with other products from the same brand for a uniform table setting. The cup and saucer can withstand temperatures of up to 220°C.